A.I. Explanation:

First sentence: This paragraph serves as the first sentence because it introduces the main topic of food storage in settled societies. It does not reference prior context, making it a clear starting point.

Concluding sentence: This paragraph concludes the sequence by summarizing the overall theme of the necessity of food storage in sedentary societies and the absence of specialists in nomadic societies, marked by the conclusive word 'Hence'.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 logically follows Paragraph 1 as it contrasts the ability to store food in settled societies with the limitations faced by nomadic hunter-gatherers, using the transitional word 'So' to indicate a consequence.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 by introducing the importance of stored food, contrasting the previous point about nomadic lifestyles with the necessity of food storage for supporting specialists, indicated by the word 'But'.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 follows logically from Paragraph 3 as it explains the implications of stored food for the existence of specialists, using 'Hence' to show the conclusion drawn from the previous statement.